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Ruslan Ermilov 2006-12-24 19:18:52 +00:00
parent 30ee21d0dc
commit 61125887f3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=165527
1 changed files with 20 additions and 20 deletions
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usr.bin/tail/tail.1
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@ -43,16 +43,10 @@
.Nd display the last part of a file
.Sh SYNOPSIS
.Nm
.Oo
.Fl F |
.Fl f |
.Fl r
.Oc
.Op Fl F | f | r
.Op Fl q
.Oo
.Fl b Ar number |
.Fl c Ar number |
.Fl n Ar number
.Fl b Ar number | Fl c Ar number | Fl n Ar number
.Oc
.Op Ar
.Sh DESCRIPTION
@ -64,21 +58,25 @@ or, by default, its standard input, to the standard output.
.Pp
The display begins at a byte, line or 512-byte block location in the
input.
Numbers having a leading plus (``+'') sign are relative to the beginning
Numbers having a leading plus
.Pq Ql +
sign are relative to the beginning
of the input, for example,
.Dq -c +2
.Dq Li "-c +2"
starts the display at the second
byte of the input.
Numbers having a leading minus (``-'') sign or no explicit sign are
Numbers having a leading minus
.Pq Ql -
sign or no explicit sign are
relative to the end of the input, for example,
.Dq -n 2
.Dq Li "-n 2"
displays the last two lines of the input.
The default starting location is
.Dq -n 10 ,
.Dq Li "-n 10" ,
or the last 10 lines of the input.
.Pp
The options are as follows:
.Bl -tag -width Ds
.Bl -tag -width indent
.It Fl b Ar number
The location is
.Ar number
@ -122,8 +120,7 @@ The
.Fl r
option causes the input to be displayed in reverse order, by line.
Additionally, this option changes the meaning of the
.Fl b ,
.Fl c
.Fl b , c
and
.Fl n
options.
@ -139,9 +136,9 @@ option is to display all of the input.
.Pp
If more than a single file is specified, each file is preceded by a
header consisting of the string
.Dq ==> XXX <==
.Dq Li "==> " Ns Ar XXX Ns Li " <=="
where
.Dq XXX
.Ar XXX
is the name of the file unless
.Fl q
flag is specified.
@ -177,8 +174,11 @@ and
.Fl n
options modify the
.Fl r
option, i.e., ``-r -c 4'' displays the last 4 characters of the last line
of the input, while the historic tail (using the historic syntax ``-4cr'')
option, i.e.,
.Dq Li "-r -c 4"
displays the last 4 characters of the last line
of the input, while the historic tail (using the historic syntax
.Dq Li -4cr )
would ignore the
.Fl c
option and display the last 4 lines of the input.